Comtech EF Data DMD-2050E - Manual (Page 13)

DMD-2050E Universal Satellite Modem Revision 2
Table of Contents MN-DMD2050E
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3.5.3.3 SCT: Serial Clock Transmit ............................................................................................ 3–17
3.5.3.4 EXT CLK/EXT BNC: External Clock, J16 .................................................................... 3–17
3.5.3.5 EXT IDI: Insert Data In .................................................................................................. 3–17
3.5.4 EXT REF: External Reference, Top BNC Port, J10 ........................................................... 3–17
3.6 Transmit Timing Options ......................................................................................................... 3–18
3.6.1 MIL-188-114A, RS-422 (TX Clock Source - SCT or SCTE) ............................................ 3–18
3.6.2 G.703 Interface ................................................................................................................... 3–18
3.6.3 HSSI Interface ..................................................................................................................... 3–18
3.6.4 Ethernet Data Interface (Optional) ...................................................................................... 3–19
3.7 Receive Timing Options............................................................................................................ 3–19
3.7.1 Loop Timing ....................................................................................................................... 3–19
3.7.2 Transmit (MIL-188-114A, RS-422) ................................................................................... 3–19
3.7.3 G.703 Interface or Asymmetrical Data Rates ..................................................................... 3–19
3.7.4 Receive ................................................................................................................................ 3–19
3.8 Ebem Framing Unit .................................................................................................................. 3–20
3.8.1 DMD2050E Information Throughput Adpatation (ITA) .................................................... 3–20
3.8.2 Embedded Channel ............................................................................................................. 3–20
3.9 STANAG Turbo Coding ........................................................................................................... 3–20
3.10 FIPs TRANSEC Module .......................................................................................................... 3–21
3.10.1 Traffic Encryption and Decryption Keys and Key Generation ........................................... 3–21
3.10.1.1 Key Agreement ........................................................................................................... 3–21
3.10.1.2 Key Agreement Algorithm .......................................................................................... 3–24
3.10.1.2.1 Key Derivation ........................................................................................................ 3–24
3.10.1.3 Accessing Encryption/Decryption Features ................................................................ 3–24
3.10.1.4 Enabling Encryption from the Front Panel ................................................................. 3–24
3.11 DoubleTalk Carrier-in-Carrier Option .................................................................................. 3–26
3.11.1 What is DoubleTalk Carrier-in-Carrier? ............................................................................. 3–27
3.11.2 Application Requirements ................................................................................................... 3–27
3.11.3 Operational Guidelines ....................................................................................................... 3–29
3.11.4 System Functionality and Operational Considerations ....................................................... 3–30
3.11.5 DoubleTalk Carrier-in-Carrier Cancellation Process .......................................................... 3–33
3.11.6 Margin Requirements .......................................................................................................... 3–35
3.11.7 Carrier-in-Carrier Latency .................................................................................................. 3–35
3.11.8 Carrier-in-Carrier and Adaptive Coding and Modulation ................................................... 3–35
3.11.9 Carrier-in-Carrier Link Design ........................................................................................... 3–35
3.11.9.1 Symmetric Data Rate Link .......................................................................................... 3–36
3.11.9.2 Asymmetric Data Rate Link ....................................................................................... 3–39
3.11.9.3 Power Limited Links ................................................................................................... 3–41
3.11.10 Carrier-in-Carrier Commissioning and Deployment....................................................... 3–42
3.11.11 Validating Carrier-in-Carrier Performance ..................................................................... 3–44
3.11.12 Operational References ................................................................................................... 3–45
3.11.12.1 Carrier-in-Carrier Link Budget Calculation ................................................................ 3–45
3.11.12.2 Estimating PSD Ratio ................................................................................................. 3–46
3.11.12.3 Estimating PSD Ratio from LST................................................................................. 3–46